Starky is the best in your list, and probably the best in tech class at the moment slightly ahead of SL.
However, in case you are urgently needing a champ that can handle defensive accuracy reduction (say if you don't have GP awakened, AA, Elektra, BW high sig, etc), then you would have to consider Crossbone using his fury stacks to deal with your defensive accuracy needs
I have all the 3 champs you listed above as 4* as well.
I had my 4* xbone (dupped) for ages, currently at R4/40. I used some of my skils t4cc to R5 for GP, saving the rest waiting for Blade.
I had my 4* starky (dupped) from previous arena grinding, currently at R4/40, but I'm having bad luck with getting enough tech t4cc, ran out after I used it to R5 my ultron long time ago
I had my 4* Thor coconut (undupped) from recent arena grinding, currently at R3/30 for arena usage at the moment. He needs to be dupped, so he'll stay in R3 for awhile
Crossbones might be the best at Ability Accuracy reduction. Stark does what? Damage? Everybody can do damage.
Nope spark does highest dps in the game sub 100 hits, evades specials, lowers attack (a good spark player keeps taunt up constantly), power controls with his power drain and taunt (even bypasses all or nothing nodes) and if you really need ability reduction, does so with his sp3. Still not good enough?
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However, in case you are urgently needing a champ that can handle defensive accuracy reduction (say if you don't have GP awakened, AA, Elektra, BW high sig, etc), then you would have to consider Crossbone using his fury stacks to deal with your defensive accuracy needs
I have all the 3 champs you listed above as 4* as well.
I had my 4* xbone (dupped) for ages, currently at R4/40. I used some of my skils t4cc to R5 for GP, saving the rest waiting for Blade.
I had my 4* starky (dupped) from previous arena grinding, currently at R4/40, but I'm having bad luck with getting enough tech t4cc, ran out after I used it to R5 my ultron long time ago
I had my 4* Thor coconut (undupped) from recent arena grinding, currently at R3/30 for arena usage at the moment. He needs to be dupped, so he'll stay in R3 for awhile
Nope spark does highest dps in the game sub 100 hits, evades specials, lowers attack (a good spark player keeps taunt up constantly), power controls with his power drain and taunt (even bypasses all or nothing nodes) and if you really need ability reduction, does so with his sp3. Still not good enough?
He's weak without being duped and having synergy. That alone removes him from consideration of being one of the best...